Richardson, a Heisman Trophy finalist, entered the draft with a season of college eligibility remaining. There should be few to question his decision. The Doak Walker Award winner has an excellent blend of power and speed, as he has been timed at 4.49 seconds in the 40 and had 25 reps in the bench press. Last season, he rushed for 1,679 yards and 21 touchdowns on 283 carries. He also had 29 receptions for 338 yards. Richardson is projected to be a top 5 pick.

Doug Martin, RB

Boise State, 5-9, 223

As the draft draws nearer, Martin's stock is rising. Projected as a second-round pick earlier, Martin, thanks to a strong showing at the NFL Scouting Combine, might be selected at the bottom of the first round. Widely viewed as a blue-collar back, Martin, who ran a 4.55 40, scored 47 total touchdowns during his career and rushed for more than 2,500 yards the past two seasons. He also added 600 yards receiving.

David Wilson, RB

Virginia Tech, 5-10, 206

Wilson doesn't have ideal size, but he has game-breaking speed. He has been clocked near 4.3 seconds in the 40. He made himself available for the draft after starting only one full year in college, skipping his senior season. Wilson, an All-Atlantic Coast Conference pick and a second-team All-American, may need to work on his pass blocking and receiving skills, but he certainly had a breakout campaign last season when he rushed for 1,709 yards on 290 carries with nine touchdowns. He's expected to be drafted in the second round.

Lamar Miller, RB

Miami, 5-11, 212

An early entrant into the draft, Miller is another one of those speedy running backs who had a breakout season in 2011. Although he has 4.4-second speed in the 40, some scouts still are concerned about his ability to pick up complicated offenses. A third-year sophomore, Miller is a tough runner who is also a capable kickoff returner. In his only full season as a starter, Miller finished second in the ACC with 1,272 yards rushing on 227 carries with nine touchdowns. He also had 15 kickoff returns for 376 yards and a dazzling 88-yard return for a touchdown against Ohio State in 2010.

LaMichael James, RB

Oregon, 5-8, 194

James is an undersized runner who was extremely productive in college, having rushed rushed for 5,082 yards and 53 touchdowns in his career. James is one of the fastest players in the draft. He has been timed in the 40-yard dash in the 4.2-4.3-range. He's also a more-than-capable receiver. But some teams will shy away from selecting him because of his lack of size. Others, though, will note that James was able to start 35 games in college and, for the most part, was able to stand up to the punishment. He is expected to be taken late in the second round.

Chris Polk, RB

Washington, 5-11, 215

Polk bounced back nicely after a sub-par showing at the Senior Bowl, running a 4.45 40 at his pro day. He still has some injury concerns because of his two shoulder surgeries at Washington, where he had the second-most rushing yards in school history and was the seventh player in Pac 12 history to rush for more than 4,000 yards. Polk also could be a good kickoff returner. Scouts still question his athleticism, however. He's expected to be a second-round pick.